From: George_McCallion**At_Symbol_Here**VWR.COM
Subject: Re: [DCHAS-L] DMF "use within 5 years"
Date: Tue, 4 Aug 2015 12:00:48 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: OF4ECD5AB0.DD0A663F-ON85257E97.00554D72-85257E97.0057F6F5**At_Symbol_Here**
In-Reply-To <12A1D57E-5DA4-4B91-9B83-60B1ACAB3717**At_Symbol_Here**>

Ralph et al,

From what I can recall when I used it, the expiration date was merely a guide; I would normally impose a 3-year limit.

Then again, I really had DMF around when I was using it in a process, otherwise a small (500mL) was typically always present.

But for prolonged storage "issues", extended life would lend exposure to acids and some alkali.

At 5 years, I would dispose of it according to local regulations, utilizing secondary containment if possible. Purifying it would not be recommended.


George D. McCallion, CHMT
Senior Specialist-Chemicals
VWR International, LLC
Radnor Corporate Center, Building One
Suite 200, P.O.Box 6660
100 Matsonford Road
Radnor, PA 19087
Office: 610.386.1449
Email: george.mccallion**At_Symbol_Here**

"If you fail to plan, then you plan to fail"

From:        "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
To:        DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU,
Date:        08/04/2015 11:31 AM
Subject:        [DCHAS-L] DMF "use within 5 years"
Sent by:        DCHAS-L Discussion List <dchas-l**At_Symbol_Here**>

During a lab inspection today, I noticed a bottle of extra pure Dimethylformamide in one of our labs that had a note on the manufacturers (Acros) label that says "use within 5 years of opening". A little Google searching doesn't seem to indicate the DMF is a peroxide former, so I wonder if anyone can shed some light on why this time limit is recommended?

The bottle was received in Jan 2011, so inquiring miles would like to know.

thanks for any insight on this.

- Ralph

Ralph Stuart CIH
Chemical Hygiene Officer
Keene State College
Keene, NH.  03431


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